// ========================================================================= //

// includes
#include "stdio.h"
#include "stdlib.h"
#include "time.h"
#include "string.h"
#include "limits.h"
#include "float.h"



#define JOTAI_NUM_RANDS_ 25

const unsigned rand_primes[JOTAI_NUM_RANDS_] = {179, 103, 479, 647, 229, 37, 271, 557, 263, 607, 18743, 50359, 21929, 48757, 98179, 12907, 52937, 64579, 49957, 52567, 507163, 149939, 412157, 680861, 757751};

int next_i() {
  int counter = 0;
  return rand_primes[(++counter)%JOTAI_NUM_RANDS_];
}

float next_f() {
  int counter = 0;
  return rand_primes[(++counter)%JOTAI_NUM_RANDS_] / 757751.0F;
} 


// Usage menu
void usage() {
    printf("%s", "Usage:\n\
    prog [ARGS]\n\
\nARGS:\n\
       0            empty\n\
\n\
");

}


// ------------------------------------------------------------------------- //

#define NULL ((void*)0)
typedef unsigned long size_t;  // Customize by platform.
typedef long intptr_t; typedef unsigned long uintptr_t;
typedef long scalar_t__;  // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */
typedef  scalar_t__ ULONG_PTR ;
typedef  int /*<<< orphan*/  ULONG ;
typedef  int UINT ;
typedef  scalar_t__ PVOID ;
typedef  scalar_t__* PUSHORT ;
typedef  scalar_t__* PUCHAR ;

/* Variables and functions */

ULONG ChecksumCompute(
  PVOID Data,
  UINT Count,
  ULONG Seed)
/*
 * FUNCTION: Calculate checksum of a buffer
 * ARGUMENTS:
 *     Data  = Pointer to buffer with data
 *     Count = Number of bytes in buffer
 *     Seed  = Previously calculated checksum (if any)
 * RETURNS:
 *     Checksum of buffer
 */
{
  register ULONG Sum = Seed;

  while (Count > 1)
    {
      Sum += *(PUSHORT)Data;
      Count -= 2;
      Data = (PVOID)((ULONG_PTR) Data + 2);
    }

  /* Add left-over byte, if any */
  if (Count > 0)
    {
      Sum += *(PUCHAR)Data;
    }

  return Sum;
}

// ------------------------------------------------------------------------- //

int main(int argc, char *argv[]) {

    if (argc != 2) {
        usage();
        return 1;
    }

    int opt = atoi(argv[1]);
    switch(opt) {

    // empty
    case 0:
    {
          long Data = ((-2 * (next_i()%2)) + 1) * next_i();
        
          int Count = ((-2 * (next_i()%2)) + 1) * next_i();
        
          int Seed = ((-2 * (next_i()%2)) + 1) * next_i();
        
          int benchRet = ChecksumCompute(Data,Count,Seed);
          printf("%d\n", benchRet); 
        
        break;
    }
    default:
        usage();
        break;

    }

    return 0;
}
